T.H. White
Author: T.H. White
Publisher: Berkley (1978)

Although nine tenths of [this] story seems to be about knights jousting and quests for the holy grail and things of that sort, the narrative is a whole, and it deals with the reasons why the young man came to grief at the end.  It is the tragedy, the Aristotelian and comprehensive tragedy, of sin coming home to roost.  That why we have to take note of the parentage of Arthur's son Mordred, and to remember, when the time comes, that the king had slept with his own sister.  He did not know he was doing so, and perhaps it may have been due to her, but it seems in tragedy, that innocence is not enough.